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Foolproof synonyms
fo͝ol'pro͝of'
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Trustworthy.
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  1. Trustworthy.
  2. Able, or easily able to be depended on.
  3. That can be depended on; trustworthy; reliable
Incapable of erring:
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  1. Incapable of erring:
  2. Incapable of failing; certain:
  3. (Roman Catholic Church) Incapable of error in expounding doctrine on faith or morals.
Guaranteed not to fail:
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  1. Guaranteed not to fail:
  2. Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
  3. Designating, of, or involving a procedure designed to prevent malfunctioning or unintentional operation, often specif. of nuclear-armed aircraft, through an intricate system of protective devices
Bound to be successful or perform as expected:
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  1. Bound to be successful or perform as expected:
Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
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  1. Capable of compensating automatically and safely for a failure, as of a mechanism or power source.
  2. Designating, of, or involving a procedure designed to prevent malfunctioning or unintentional operation, often specif. of nuclear-armed aircraft, through an intricate system of protective devices
  3. Acting to discontinue a military attack on the occurrence of any of various predetermined conditions.
Find another word for foolproof. In this page you can discover 7 synonyms, antonyms, idiomatic expressions, and related words for foolproof, like: dependable, infallible, fail-safe, sure-fire, reliable, fail-safe and thrive.